Are any crew skills profitable on their own without the GTN in SW:TOR?
I am speaking of both crafting and missions. Are any of the crew skills (in any combination) generally profitable (making more credits than the missions cost) at the highest tier, without selling rewarded/crafted goods on the GTN to other players? How much of a margin can be made this way if your skills are at 400?
(Note: I realize that more credits can be made by crafting in-demand items and selling them with a huge markup, but this question is about avoiding the GTN and selling the results to ordinary vendors.)